Well the Prometheus is like a scientific research ship so their equipment is gonna be top of the line whereas the Nostromo was like a corporate mining vessel so their stuff was probably as cheap as possible therefore the difference isn't so unbelievable although ultimately who cares.

Yeah, the Nostromo and its crew were supposed to be grungy, not high tech. Not only that but it was planned to be a 'capture and return' mission all along so there was no need to waste a good ship and equipment and crew on that mission.